If position is -1, then the newly created column is inserted at the end. The column is initialized with the attributes given. If tree_view has "fixed_height" mode enabled, then the new column will have its sizing property set to be GTK_TREE_VIEW_COLUMN_FIXED.

See also gtk_tree_view_column_set_cell_data_func(), gtk_tree_view_column_pack_start(). If tree_view has "fixed_height" mode enabled, then the new column will have its "sizing" property set to be GTK_TREE_VIEW_COLUMN_FIXED.

If column is NULL, then no horizontal scrolling occurs. Likewise, if path is NULL no vertical scrolling occurs. At a minimum, one of column or path need to be non-NULL. row_align determines where the row is placed, and col_align determines where column is placed. Both are expected to be between 0.0 and 1.0. 0.0 means left/top alignment, 1.0 means right/bottom alignment, 0.5 means center.

If use_align is FALSE, then the alignment arguments are ignored, and the tree does the minimum amount of work to scroll the cell onto the screen. This means that the cell will be scrolled to the edge closest to its current position. If the cell is currently visible on the screen, nothing is done.

This function only works if the model is set, and path is a valid row on the model. If the model changes before the tree_view is realized, the centered path will be modified to reflect this change.

Sets a user function for determining where a column may be dropped when dragged.

GtkTreeView.set_column_drag_function( func, user_data )

func

A function to determine which columns are reorderable, or NULL.

user_data

User data to be passed to func, or NULL.

This function is called on every column pair in turn at the beginning of a column drag to determine where a drop can take place. The arguments passed to func are: the GtkTreeViewColumn being dragged, the two GtkTreeViewColumn determining the drop spot, and user_data. If either of the GtkTreeViewColumn arguments for the drop spot are NULL, then they indicate an edge. If func is set to be NULL, then tree_view reverts to the default behavior of allowing all columns to be dropped everywhere.

This is useful when you want to focus the user's attention on a particular row. If focus_column is not NULL, then focus is given to the column specified by it. Additionally, if focus_column is specified, and start_editing is TRUE, then editing should be started in the specified cell. This function is often followed by gtk_widget_grab_focus (tree_view) in order to give keyboard focus to the widget. Please note that editing can only happen when the widget is realized.

If path is invalid for model, the current cursor (if any) will be unset and the function will return without failing.

This is useful when you want to focus the user's attention on a particular row. If focus_column is not NULL, then focus is given to the column specified by it. If focus_column and focus_cell are not NULL, and focus_column contains 2 or more editable or activatable cells, then focus is given to the cell specified by focus_cell. Additionally, if focus_column is specified, and start_editing is TRUE, then editing should be started in the specified cell. This function is often followed by gtk_widget_grab_focus (tree_view) in order to give keyboard focus to the widget. Please note that editing can only happen when the widget is realized.

If path is invalid for model, the current cursor (if any) will be unset and the function will return without failing.

This function tells GTK+ that the user interface for your application requires users to read across tree rows and associate cells with one another.

GtkTreeView.set_rules_hint( setting )

setting

TRUE if the tree requires reading across rows

By default, GTK+ will then render the tree with alternating row colors. Do not use it just because you prefer the appearance of the ruled tree; that's a question for the theme. Some themes will draw tree rows in alternating colors even when rules are turned off, and users who prefer that appearance all the time can choose those themes. You should call this function only as a semantic hint to the theme engine that your tree makes alternating colors useful from a functional standpoint (since it has lots of columns, generally).

Sets whether to draw and enable expanders and indent child rows in tree_view.

GtkTreeView.set_show_expanders( enabled )

enabled

TRUE to enable expander drawing, FALSE otherwise.

When disabled there will be no expanders visible in trees and there will be no way to expand and collapse rows by default. Also note that hiding the expanders will disable the default indentation. You can set a custom indentation in this case using gtk_tree_view_set_level_indentation(). This does not have any visible effects for lists.